Detections
Analytics
AlmaLinux 8 : samba (ALSA-2023:7467)
critical Nessus Plugin ID 186293
Synopsis
The remote AlmaLinux host is missing one or more security updates.Description
The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2023:7467 advisory.- A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients to remote procedure call (RPC) services like SAMR LSA or SPOOLSS, which Samba initiates on demand.
However, due to inadequate sanitization of incoming client pipe names, allowing a client to send a pipe name containing Unix directory traversal characters (../). This could result in SMB clients connecting as root to Unix domain sockets outside the private directory. If an attacker or client managed to send a pipe name resolving to an external service using an existing Unix domain socket, it could potentially lead to unauthorized access to the service and consequential adverse events, including compromise or service crashes. (CVE-2023-3961)
- A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module acl_xattr is configured with acl_xattr:ignore system acls = yes. The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions. (CVE-2023-4091)
- A vulnerability was found in Samba's rpcecho development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the rpcecho service operates with only one worker in the main RPC task, allowing calls to the rpcecho server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a sleep() call in the dcesrv_echo_TestSleep() function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the rpcecho server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as rpcecho runs in the main RPC task. (CVE-2023-42669)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Critical
ID: 186293
File Name: alma_linux_ALSA-2023-7467.nasl
Version: 1.2
Type: local
Family: Alma Linux Local Security Checks
Published: 11/27/2023
Updated: 12/20/2023
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2023-3961
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:alma:linux:samba-vfs-iouring, cpe:/o:alma:linux:8::nfv, cpe:/o:alma:linux:8::sap_hana, cpe:/o:alma:linux:8::resilientstorage, p-cpe:/a:alma:linux:samba-test-libs, p-cpe:/a:alma:linux:samba-common-tools, p-cpe:/a:alma:linux:samba-winbind-modules, p-cpe:/a:alma:linux:samba-tools, p-cpe:/a:alma:linux:ctdb, p-cpe:/a:alma:linux:samba-winbind, p-cpe:/a:alma:linux:samba-winbind-clients, p-cpe:/a:alma:linux:samba-winexe, p-cpe:/a:alma:linux:samba-test, p-cpe:/a:alma:linux:samba-common-libs, p-cpe:/a:alma:linux:libsmbclient, p-cpe:/a:alma:linux:samba-client, cpe:/o:alma:linux:8::appstream, cpe:/o:alma:linux:8, p-cpe:/a:alma:linux:samba-common, p-cpe:/a:alma:linux:samba, p-cpe:/a:alma:linux:samba-usershares, p-cpe:/a:alma:linux:samba-dcerpc, p-cpe:/a:alma:linux:samba-devel, p-cpe:/a:alma:linux:libwbclient, p-cpe:/a:alma:linux:libnetapi-devel, cpe:/o:alma:linux:8::realtime, p-cpe:/a:alma:linux:python3-samba-test, cpe:/o:alma:linux:8::baseos, p-cpe:/a:alma:linux:samba-pidl, cpe:/o:alma:linux:8::sap, p-cpe:/a:alma:linux:libsmbclient-devel, p-cpe:/a:alma:linux:libwbclient-devel, p-cpe:/a:alma:linux:samba-winbind-krb5-locator, p-cpe:/a:alma:linux:samba-libs, p-cpe:/a:alma:linux:python3-samba-devel, p-cpe:/a:alma:linux:samba-ldb-ldap-modules, p-cpe:/a:alma:linux:samba-krb5-printing, p-cpe:/a:alma:linux:libnetapi, cpe:/o:alma:linux:8::supplementary, p-cpe:/a:alma:linux:samba-client-libs, p-cpe:/a:alma:linux:python3-samba-dc, cpe:/o:alma:linux:8::highavailability, p-cpe:/a:alma:linux:python3-samba, p-cpe:/a:alma:linux:samba-dc-libs, cpe:/o:alma:linux:8::powertools
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 11/22/2023
Vulnerability Publication Date: 10/10/2023